10 2 3 4 6 7 9 4w 7w 9w 11 Babacar Dilindi Concept Quiz 16: answers • The line 0-1 is a RIGHT RUNNING mach wave • The line 0-3 is a RIGHTRUNNING Mach wave • The line 4-4w marks the boundary between a uniform and simple region - TRU! • I - is a constant everywhere in the region enclosed by 0-1-4-0 - TRU! • I is a constant at some points in the region enclosed by 0-1-4-0 - TRU! • !lthough we are only showing 4 characteristic lines and their reflections" the regi 4-10-1- would really have curved characteristics # TRU! • The value of theta is t"e an#le line o$ 1%11 degrees • The initial $randtl-Meyer angle at the inlet is based on the inlet Mach number as we Mach number that we must turn to the flow to # TRU! • $oint 4 has both I 4- invariants as a constant at this point" & 4 and ' 4 may be calculated by knowing I o- and I 10 - &'()! • !dding more Mach lines would INCR!')! accuracy of this calculation
The line 0-1 is a RIGHT RUNNING mach wave The line 0-3 is a
RIGHT-RUNNING Mach wave The line 4-4w marks the boundary between a
uniform and simple region - TRUE I- is a constant everywhere in the
region enclosed by 0-1-4-0 - TRUE I+ is a constant at some points
in the region enclosed by 0-1-4-0 - TRUE Although we are only
showing 4 characteristic lines and their reflections, the region
bound by 1-4-10-1- would really have curved characteristics TRUE
The value of theta is the angle line of 10-11 degrees The initial
Prandtl-Meyer angle at the inlet is based on the inlet Mach number
as well as the exit Mach number that we must turn to the flow to
TRUE Point 4 has both I4- invariants as a constant at this point, 4
and 4 may be calculated by knowing Io- and I10+ - FALSE Adding more
Mach lines would INCREASE accuracy of this calculation
What is the point of the method of characteristics for designing
a rocket nozzle? The method of characteristics is highly useful in
designing minimum length nozzles. The method then outputs a nozzle
with a sharp corner for the initial expansion, and the rest of it
is simply the straightening section. This allows to circumvent the
weight and length penalties associated with gradual-expansion
nozzles.
